diff --git a/carthage/local.py b/carthage/local.py
index 9168407..8b8bffc 100644
--- a/carthage/local.py
+++ b/carthage/local.py
@@ -33,7 +33,7 @@ async def filesystem_access(self, user=None):
         if user is None:
             user = self.runas_user
         if user != os.environ['USER']:
-            with super().filesystem_access(user=user) as path:
+            async with super().filesystem_access(user=user) as path:
                 yield path
                 return